Plumbing cap lock



FIG. 1 is an environmental perspective view of a plumbing cap lockshowing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a left side elevational view with the right side view and therear view being mirror images thereof; and,

FIG. 5 is a bottom view thereof.

The broken line partial showing of a urinal in FIG. 1 is forillustrative purposes only and forms no part of the claimed design.

The ornamental design for a plumbing cap lock, as shown and described.